12. [1pt] Aww Hint: Think back to non-uniform circular motion (in particular, the bucket of water demo). A roller-coaster car may be represented by a block of mass 88.0 kg. The car is released from rest at a height h = 60.5 m above the ground and slides along a frictionless track. The car encounters a loop of radius R = 13.5 m at ground level, as shown. As you will learn in the course of this problem, the initial height is great enough so that the car never loses contact with the track. Calculate the kinetic energy of the car at the top of the loop. Answer: Submit All Answers 13. [1pt] * * * Find the minimum initial height at which the car can be released that still allows the car to stay in contact with the track at the top of the loop. Answer: Submit All Answers